Wiring problems of the 2008 Mitsubishi Lancer

My son was attempting to stop at a red light when the brakes started to pulse uncontrollably, and the brake pedal when down to the floor. Also the abs light lit up. Unfortunately he could not stop in time and he hit the car in front of him. Three weeks later after the car was repaired, I went to go start the car and the car would not go into gear, the instrument panel lit up and some of my electric stop working. I had the car towed to the dealer. After two days of diagnostics they said there was a problem with a wiring harness due to the accident. I tried to explain to the dealer that the abs was the reason we had the accident in the first place and that was when the electrical problem started. There was a bill for $423 that we had to pay because the dealer insisted the problem was due to the accident. I will be in touch with Mitsubishi to see if this can be rectified. Also I do hope someone will investigate this electrical problem. It was very unnerving to hit the brakes and the car would not stop.